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Java小白第一次就能看懂的网络编程

顺亿
顺亿
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目录

一、网络基础

二、网络协议

URL类

一、网络基础

二、网络协议

实现TCP的网络编程例子1：客户端发送信息给服务端，服务端将数据显示在控制台上public class TCPTest1 {//客户端@Test public void client() {Socket socket = null;OutputStream os = null;try {//1.创建Socket对象，指明服务器端的ip和端口号InetAddress inet = InetAddress.getByName("127.0.0.1");socket = new Socket(inet, 8899);//2.获取一个输出流，用于输出数据os = socket.getOutputStream();//3.写出数据的操作os.write("你好，我是客户端mm".getBytes());} catch (IOException e) {e.printStackTrace();} finally {//4.资源的关闭if(os != null){try {os.close();} catch (IOException e) {e.printStackTrace();}}if(socket != null){try {socket.close();} catch (IOException e) {e.printStackTrace();}}}

}//服务端@Test public void server(){ServerSocket ss = null;Socket socket = null;InputStream is = null;ByteArrayOutputStream baos = null;try {//1.创建服务器的ServerSocket,指明自己的端口号ss = new ServerSocket(8899);//2.调用accept()表示接收来自于客户端的socket socket = ss.accept();//3.获取输入流is = socket.getInputStream();//不建议这样写，可能会有乱码// byte[] buffer = new byte[1024];// int len;// while((len = is.read(buffer)) != -1){// String str = new String(buffer,0,len);// System.out.println(str);// }//4.读取输入流中的数据baos = new ByteArrayOutputStream();byte[] buffer = new byte[5];int len;while((len = is.read(buffer)) != -1){baos.write(buffer,0,len);}System.out.println(baos.toString());} catch (IOException e) {e.printStackTrace();} finally {//5.关闭资源if(baos != null){try {baos.close();} catch (IOException e) {e.printStackTrace();}}if(is != null){try {is.close();} catch (IOException e) {e.printStackTrace();}}if(socket != null){try {socket.close();} catch (IOException e) {e.printStackTrace();}}if(ss != null){try {ss.close();} catch (IOException e) {e.printStackTrace();}}}}}实现TCP的网络编程例题2：客户端发送文件给服务端，服务端将文件保存在本地。

public class TCPTest2 {//这里异常处理的方式应该使用try-catch-finally@Test public void client() throws IOException {Socket socket = new Socket(InetAddress.getByName("127.0.0.1"), 9090);OutputStream os = socket.getOutputStream();FileInputStream fis = new FileInputStream(new File("beauty.jpg"));byte[] buffer = new byte[1024];int len;while((len = fis.read(buffer)) != -1){os.write(buffer,0,len);}fis.close();os.close();socket.close();}//这里异常处理的方式应该使用try-catch-finally@Test public void server() throws IOException {ServerSocket ss = new ServerSocket(9090);Socket socket = ss.accept();InputStream is = socket.getInputStream();FileOutputStream fos = new FileOutputStream(new File("beauty1.jpg"));byte[] buffer = new byte[1024];int len;while((len = is.read(buffer)) != -1){fos.write(buffer,0,len);}fos.close();is.close();socket.close();ss.close();}}实现TCP的网络编程例题3：从客户端发送文件给服务端，服务端保存到本地，并返回"发送成功"给客户端。并关闭相应的连接

public class TCPTest3 {@Test public void client() throws IOException {Socket socket = new Socket(InetAddress.getByName("127.0.0.1"), 9090);OutputStream os = socket.getOutputStream();FileInputStream fis = new FileInputStream(new File("beauty.jpg"));byte[] buffer = new byte[1024];int len;while((len = fis.read(buffer)) != -1){os.write(buffer,0,len);}//服务区端给予客户端反馈OutputStream os1 = socket.getOutputStream();os.write("你好，美女，照片我以收到，非常漂亮！".getBytes());fis.close();os.close();socket.close();os1.close();

}//这里异常处理的方式应该使用try-catch-finally@Test public void server() throws IOException {ServerSocket ss = new ServerSocket(9090);Socket socket = ss.accept();InputStream is = socket.getInputStream();FileOutputStream fos = new FileOutputStream(new File("beauty2.jpg"));byte[] buffer = new byte[1024];int len;while((len = is.read(buffer)) != -1){fos.write(buffer,0,len);}//接受来自于服务器端的数据，并显示到控制台上InputStream is1 = socket.getInputStream();ByteArrayOutputStream baos = new ByteArrayOutputStream();byte[] bufferr = new byte[20];int len1;while((len1 = is1.read(buffer)) != -1){baos.write(buffer,0,len1);}System.out.println(baos.toString());fos.close();is.close();socket.close();ss.close();baos.close();}}

UDP协议的网络编程public class UDPTest {@Test public void sender() throws IOException {DatagramSocket socket = new DatagramSocket();

String str = "我是UDP方式发送的导弹";byte[] data = str.getBytes();InetAddress inet = InetAddress.getLocalHost();DatagramPacket packet = new DatagramPacket(data,0,data.length,inet,9090);socket.send(packet);socket.close();}@Test public void receiver() throws IOException {DatagramSocket socket = new DatagramSocket(9090);byte[] buffer = new byte[100];DatagramPacket packet = new DatagramPacket(buffer, 0, buffer.length);socket.receive(packet);System.out.println(new String(packet.getData(),0,packet.getLength()));}

URL类

URL网络编程

1.URL:统一资源定位符，对应着互联网的某一资源地址

2.格式：

http://localhost:8080/examples/beauty.jpg?username=Tom协议 主机名 端口号 资源地址 参数列表

public class URLTest {public static void main(String[] args) {try {URL url = new URL("http://localhost:8080/examples/beauty.jpg?username=Tom");// public String getProtocol() 获取该URL的协议名System.out.println(url.getProtocol());// http// public String getHost() 获取该URL的主机名System.out.println(url.getHost());//localhost// public String getPort() 获取该URL的端口号System.out.println(url.getPort());// 8080// public String getPath() 获取该URL的文件路径System.out.println(url.getPath());//examples/beauty.jpg// public String getFile() 获取该URL的文件名System.out.println(url.getFile());//examples/beauty.jpg?username=Tom// public String getQuery() 获取该URL的查询名System.out.println(url.getQuery());//username=Tom} catch (MalformedURLException e) {e.printStackTrace();}}}到此这篇关于Java小白第一次就能看懂的网络编程的文章就介绍到这了,更多相关Java网络编程内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

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